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- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/05%3A_Electrons_in_Atoms/5.06%3A_Bohr's_Atomic_ModelThis page explores the analogy of climbing a ladder to explain potential energy and Niels Bohr's 1915 atomic model, where electrons occupy fixed energy states around the nucleus. It describes how elec...This page explores the analogy of climbing a ladder to explain potential energy and Niels Bohr's 1915 atomic model, where electrons occupy fixed energy states around the nucleus. It describes how electrons can gain or emit energy, often as light, when transitioning between these states. While effective for hydrogen, the model's limitations with other elements led to revisions in atomic theory.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/03%3A_Measurements/3.05%3A_Mass_and_WeightThis page explores weightlessness in outer space and its effects on astronauts' bone health. It clarifies the difference between mass, a constant measure of matter, and weight, which is influenced by ...This page explores weightlessness in outer space and its effects on astronauts' bone health. It clarifies the difference between mass, a constant measure of matter, and weight, which is influenced by gravity. The text also mentions that weight is less on the moon than on Earth, while mass stays the same regardless of location. Additionally, it gives a brief explanation of how to measure mass and weight.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/02%3A_Matter_and_Change/2.01%3A_Matter_Mass_and_VolumeThis page explains the nature of matter, defining it as the substance constituting everything in the universe. It clarifies mass as the quantity of matter, measured in kilograms, and differentiates it...This page explains the nature of matter, defining it as the substance constituting everything in the universe. It clarifies mass as the quantity of matter, measured in kilograms, and differentiates it from weight, the gravitational force on mass. Volume is defined as the space occupied by an object, measured in cubic meters or liters, with various measuring methods presented, including displacement for irregular shapes. The page underscores that all matter possesses both mass and volume.
